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when I bought my roadrunner ( 340 4 speed ) the guy I got it from said the car still retained the "original " running gear, said something about a shortage of 8 3/4 diffs at the St. Louis plant and it had a 8 1/4 possi diff that he said was a 3:23 ratio . I want to keep it original if it belongs to the car so the big question is would a 71 340 b body come with a 3: 23 possi 8 1/4 diff? its a late build date (504) with a lot of 72 parts